1. The number of protons represents the a. atomic mass b. atomic number c. atomic weight d. atomic Isotope 2. The number of electrons in an element equals a. the number

of neutrons b. the number of protons c. the number of protons + neutrons d. the number of protons-neutrons 3. An element has an atomic number of 25. That element is a. Na b. Sr c. Mn d. Cr 4. One proper way to indicate an isotope of Si with an atomic mass of 28 is a. 28-SI b. Si-28 C. 285 28 Si d. 5. How many neutrons are in the nucleus of Mo? a. 53 b. 42 c. 48 U.S4